Kirari Momobami is a major antagonist from Kakegurui and is the 105th student council president at Hyakkaou Private Academy, as well the one responsible for the current hierarchy at the academy. Kirari's family is aligned with Yumeko Jabami's family.
Kirari Momobami is a girl with an average height. She has very light skin and long white hair, that is shown as being gray in the anime. She wears it in two knotted rings with ribbons entwined in them and a long bang that has two locks of hair on either side that come down to about her eyes. She has blue eyes and is shown to wear a shade of blue lipstick and has blue painted nails (though in some official art it is seen as pink). She wears the standard Hyakkaou Private Academy school uniform which is a red blazer with black trim on the cuffs and around the neck, and is decorated with gold buttons that is complete with a black tie. She wears a gray colored skirt with patterns on it, black colored panty hose, and Hyakkaou Private Academy's brown loafers with black soles. Outside of Hyakkaou Private Academy, she wears a black kimono with her family crest on the back and two crests on the sides with a floral printed obi and floral print on the lower part of the kimono and wearing white tabi.
Although a refined and proper lady on the outside, Kirari is in truth a calculating, manipulative, psychopathic individual with little regard for anything other than herself. A complete narcissist, she belittles everyone besides her, believing everyone is to play by her terms alone, as seen when Mary rejected her invitation to join the student council, she simply ridiculed whatever reasons could be had, as simply foolish and illogical.
Being the creator of the infamous pet system, where she purportedly encourages mistreatment, bullying and sub-human conditions on other students, reveals a sadistic side to her as well. This is further proven during her showdown with Midari, where she had her pay with her left eye stating curiosity for how the other side of an eyeball must look like, all the while with a malicious glee, causing Midari to realize she has no regard for human life at all.
As Kirari imposes life plans or other tormenting punishment upon losers, she seems to relish on imposing fear on others and make their lives as miserable as possible, if anything for amusement at the very least, and financial or political benefits at most, disclosing a twisted, self-centered person.
Kakegurui - Compulsive Gambler
Two years prior to the start of the series, Momobami became the student council president when she was a first year high school student and was the one that carried out the reform were she created the donation and the "dog" and "cat" system. It is known that she won the election not through voting but through gambling against the former student council president. Her win causes the discrimination already present at Hyakkaou Private Academy to become stronger with the oppresion increasing strongly against those who are weak against gambling.
After Yumeko won the gamble against Itsuki Sumeragi, Sayaka Igarashi enters the student council room where Kirari is sitting. She asks the student council members what they should do against Yumeko, which she responds to her that they will intervene a little with her and see how it goes.